CN107304487B - Device for cooling an annularly extruded filament bundle - Google Patents
Device for cooling an annularly extruded filament bundle Download PDFInfo
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- CN107304487B CN107304487B CN201710252029.2A CN201710252029A CN107304487B CN 107304487 B CN107304487 B CN 107304487B CN 201710252029 A CN201710252029 A CN 201710252029A CN 107304487 B CN107304487 B CN 107304487B
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- blowing
- connection adapter
- flow
- air
- nozzle
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
- D01D5/092—Cooling filaments, threads or the like, leaving the spinnerettes in shafts or chimneys
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/08—Melt spinning methods
- D01D5/088—Cooling filaments, threads or the like, leaving the spinnerettes
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
Abstract
The invention relates to a device for cooling an annular extruded filament bundle which is extruded through a plurality of nozzle bores of an annular spinning nozzle. The apparatus has: a blowing gas flow generator having a radially surrounding blowing gas outlet and arranged centrally below the annular spinning nozzle. The insufflation flow generator is held by a connection adapter that connects the insufflation flow generator with the air inlet passage. In order to homogenize the supplied cooling air immediately before it enters the blowing air flow generator, in particular with respect to the temperature of the cooling air, the connection adapter is provided according to the invention with a flow barrier made of a porous metal foam, preferably a porous aluminum foam.
Description
Technical Field
The invention relates to a device for cooling an annularly extruded filament bundle/filament curtain.
Background
During melt spinning of synthetic fiber slivers or filaments, a plurality of fine, sliver-shaped filaments are extruded through the nozzle bores of a spinning nozzle. For this purpose, the molten polymer is fed under high pressure to a spinning nozzle. In order to form a fiber strand or a plurality of filaments, a plurality of strand-shaped monofilaments are combined in their entirety or in bundles. Before the merging, the filaments are cooled by a cooling air flow, so that the molten state of the filaments is converted into a solidified state after being discharged from the nozzle hole. Of particular importance to the quality of the fiber sliver or filament is the uniformity of cooling of all the filaments. It is therefore known, in particular for the production of staple/staple fibers, to guide a plurality of freshly extruded filaments in an annular arrangement, wherein a blowing air generator is arranged in the center of the filament bundle, which blowing air generator generates a cooling air flow radially from the inside to the outside. It is thus possible to cool a plurality of filaments uniformly from one side. Such a device for cooling an annularly extruded filament bundle is known, for example, from DE 3708168 a 1.
In this known device, a blowing candle/blowing cylinder/blowing rod (blastkerze) is arranged as a blowing-air flow generator below the annular spinning nozzle, which is connected with an open end to the connection adapter. The connection adapter is connected to an intake passage through which cooling air is supplied. In order to generate a cooling air flow that is as homogeneous and uniform as possible, the blowing candle has a porous blowing cover, which can be made of sintered metal or metal foam. However, such a blowing hood has a relatively small wall thickness, so that homogenization of the cooling air is only possible under certain conditions. It is therefore known that inhomogeneities in the pressure, temperature and volume flow already occur when the cooling air is supplied. In particular, the temperature difference in the supplied cooling air directly affects the cooling performance of the filaments.
Furthermore, in the known device, the inlet duct must penetrate the filament curtain, so that an additional thermal boundary effect on the inlet duct in the region of the filament guides, which acts on the interior of the inlet duct, cannot be ruled out.
In principle, devices of this type are also known in which cooling air is supplied from above through the spinning beam to the blowing air generator in the center of the annular spinning nozzle. The thermal boundary effect is however increased by the heated part of the guide melt inside the spinning beam, so that the temperature difference in the supplied cooling air can also be more intense.
Disclosure of Invention
The object of the present invention is to improve a device of the type mentioned for cooling an annularly extruded filament bundle in such a way that the cooling of the fiber strand and the filaments can be achieved with high uniformity.
This object is achieved according to the invention in that the connection adapter is provided with a flow barrier made of a porous metal foam, preferably a porous aluminum foam.
The invention is distinguished in that the cooling air must penetrate the labyrinth of metal pores before entering the blowing air flow generator and in that case the temperature difference in the cooling air is homogenized. By forming the flow barrier made of metal foam, a relatively high heat transfer capacity is achieved, which enables temperature equalization in the cooling air. A high degree of coordination of the cooling air temperature is achieved in particular by using aluminium foam.
In order to be able to use a common source of cooling air, which is formed, for example, by a conventional air conditioner, the development of the invention in which the flow barrier has a pore diameter in the range from 5PPI to 15PPI (pores per inch) is particularly advantageous. A relatively small pressure drop can thus be achieved when the cooling air flow passes through.
In addition to the cooling air temperature, pressure fluctuations and volume flow fluctuations of the cooling air can also be homogenized particularly advantageously before entering the blowing air flow generator. For this purpose, the flow barrier is designed in the form of a plate with a minimum height of 10mm, preferably 30mm, and extends within the free flow cross section of the air channel. It is thus also possible to advantageously compensate for pressure surges, which are caused, for example, by switching adjacent cooling devices on and off. The flow barrier thus prevents disturbances in the cooling air supply from possibly acting on the blowing air generator.
In order to coordinate the cooling air in a timely manner, the flow barrier can be arranged either directly on the intake side of the connection adapter or on the discharge side of the connection adapter. In principle, the following possibilities also exist: two separate flow barriers are arranged both on the inlet side and on the outlet side of the connection adapter. There is thus the possibility of: the type of blowing flow generator which has been used for cooling the annularly extruded filament bundle is additionally equipped with a flow barrier according to the invention.
When the flow barrier is arranged on the inlet side of the connection adapter, a development of the invention is preferably carried out in which the air duct is arranged on the inlet side of the connection adapter and forms the inlet duct. This development is particularly suitable for achieving a high degree of integration between the connection adapter and the insufflation flow generator on the discharge side.
It is therefore also provided that the connection adapter is arranged centrally in the annular nozzle on the underside of the spinning beam, wherein the air inlet channel penetrates the spinning beam until it reaches the connection adapter.
The blowing air flow generator is preferably formed by a blowing nozzle device, wherein the radially encircling ventilation slot forms a blowing air outlet. This is a particularly compact arrangement in which the cooling air supplied is conditioned immediately before entering the blow nozzle device.
In the case of an alternative arrangement of the flow barrier on the outlet side of the connection adapter, a development is preferably made in which the air channel is arranged on the outlet side of the connection adapter and forms the blowing inlet of the blowing flow generator.
For this purpose, the blowing flow generator is a hollow cylindrical blowing candle which has an air channel located inside which forms the blowing inlet on the open end. The connection adapter supporting the blowing candles is arranged at a distance below the annular spinning nozzle. In this case, the blowing inlet of the blowing candle can be used directly for receiving the flow barrier.
The blow-out opening is formed in the blow candle by a gas-permeable blow-out cover which surrounds the air channel until the closed end is reached. The cooling air entering the air duct inside the blower housing has a uniform temperature and a uniform pressure.
The apparatus according to the invention is distinguished in that the annularly guided filament bundle can be cooled uniformly over the entire circumference. The uneven deflection of the filament bundles due to uneven pressure and uneven volume flow is advantageously avoided here. Due to the coordinated cooling air temperature, the same cooling of the filaments in the filament bundle can be achieved.
Drawings
The invention is explained in detail below with reference to the figures according to some embodiments of the device. Wherein:
fig. 1 schematically shows a first embodiment of an apparatus according to the invention for cooling an endless extruded filament bundle.
Fig. 2 schematically shows another embodiment of an apparatus for cooling an endless extruded filament bundle according to the invention.
Fig. 3 schematically shows a view of a flow barrier made of metal foam.
Detailed Description
Fig. 1 schematically shows a view of a first exemplary embodiment of a device according to the invention for cooling an annularly extruded filament bundle. The device is integrated directly into the spinning beam 6. The spinning beam 6 supports the annular spinning nozzle 4 on its underside. The annular spinning nozzle 4 has a plurality of nozzle bores 4.1 which are arranged uniformly distributed on the underside of the annular spinning nozzle 4. The annular spinning nozzle 4 is coupled to a spinning pump, not shown here, in order to extrude the polymer melt.
The connection adapter 2 is held centrally with respect to the annular spinning nozzle 4 on the underside of the spinning beam 6. The connection adapter 2 supports a blowing gas flow generator 1 arranged below the annular spinning nozzle 4. The blowing flow generator 1 is formed in this embodiment by a blowing nozzle device 9. The blow nozzle arrangement 9 has two nozzle plates 10.1 and 10.2, which form a pressure chamber 25 between them. The pressure chamber 25 is connected to the environment via the vent slot 12. The ventilation slot 12 forms a circumferential blowing air outlet 11.
The blow nozzle device 9 is arranged on the discharge side 30 of the connection adapter 2. The connection adapter 2 has a holder 14 and a receiving pin 13 which is fixed to the holder 14. The holder 14 is arranged on the spinning beam 6. The receiving peg 13 serves to receive the nozzle plates 10.1 and 10.2.
A flow barrier 5 is arranged inside the air channel 8 on the opposite inlet side 29 of the connection adapter 2. The air channel 8 forms an intake channel 3, through which cooling air is supplied to the connection adapter 2 from a cooling air source not shown here.
The flow barrier 5 is made of porous metal foam and extends in the form of a plate over the entire flow cross section of the air channel 8. The air duct 8 is connected to the pressure chamber 25 of the blow nozzle device 9 via an inlet opening 31 in the holder 14.
To further clarify the flow barrier 5, reference is additionally made to fig. 3. One embodiment of a flow barrier is schematically shown in one view in fig. 3.
The flow barrier 5 is made of a porous metal foam 32. In order to provide the largest possible inner surface for the cooling air flowing through with a relatively low flow resistance, the metal foam 32 has a plurality of open pores 33 with a pore diameter in the range from 5PPI to 15 PPI. The unit PPI herein represents the number of fine pores 33 per unit length of inch. In this regard, relatively large pores are formed in the flow barrier 5. The flow barrier 5 is preferably made of aluminum foam in terms of cooling air temperature homogenization. The relatively high heat transfer capacity is particularly advantageous in this case for achieving/maintaining homogenization when the cooling air flows through.
The flow barrier 5 is preferably designed as a plate and has a height of at least 10 mm. In the case of large cooling air volume flows, the minimum height is selected to be approximately 30 mm. The height of the flow barrier 5 is indicated by the letter H in fig. 3.
The outer contour of the flow barrier 5 substantially depends on the flow cross section of the air channel 8 in which the flow barrier 5 is arranged. A circular, oval or angular cross section can thus be achieved.
In the embodiment of the apparatus according to the invention shown in fig. 1, the filament bundle extruded through the annular spinning nozzle 4 is cooled by a relatively vigorous blowing gas stream immediately after discharge. The blowing nozzle device 9 generates a continuous blowing gas flow at the ventilation slot 12, which penetrates the filament bundle 7 uniformly from the inside to the outside over the entire circumference. Furthermore, the apparatus is shown in operation in fig. 1. Cooling air is supplied through the inlet channel 3, for example by means of a blower, and penetrates the flow barrier 5 at the end of the air channel 8. The cooling air is then conducted into the pressure chamber 25 of the blow nozzle device 9 through the inlet opening 31. From there, the cooling air passes radially outward through the ventilation slot 12 and onto the filament bundle 7.
In fig. 2, a further exemplary embodiment of a device according to the present invention is schematically illustrated in one view.
The device has a connecting adapter 2 below the spinning device, which supports the blowing gas flow generator 1 on the outlet side 30. The blowing flow generator 1 is designed in this case as a blowing candle 15. The blowing candle 15 has a porous blowing casing 20, which can be made of, for example, a nonwoven, a foam, a screen or a sintered material. The air blowing cover 20 is formed with air blowing outlets 11 over the entire circumference thereof to generate cooling air flowing from the inside to the outside in the radial direction.
At the free end, the blower candle 15 is closed by a centering attachment/shoulder 27. With the opposite open end, the blower candle 15 is guided in the guide tube 23 via the connecting piece 32. The guide tube 23 is held on the connection adapter 2 and opens into a pressure chamber 25 inside the connection adapter 2. The pressure chamber 25 of the connection adapter 2 is connected to the laterally fed inlet channel 3, which is connected to the inlet side 29 of the connection adapter 2.
Inside the pressure chamber 25, the connection adapter 2 holds a guide cylinder 24, which is connected to the connection 32 of the blowing candle 15 by a piston rod 35. The blower candle 15 can be adjusted inside the guide tube 23 between a rest position and an operating position by means of the guide cylinder 24. For sealing, a seal 26 is provided on the outer periphery of the connecting piece 32 with respect to the wall of the guide tube 23.
The connecting element 32 and the blowing cover 20 of the blowing candle 15 form an air channel 8 located inside, which forms the designed blowing inlet 21 at the open end of the blowing candle 15 and is connected to the pressure chamber 25. A flow barrier 5 is arranged in the interior of the air duct 8 in the region of the connection 32. The flow barrier 5 is designed as a plate and extends over the entire flow cross section of the air channel 8. The flow barrier 5 is made of metal foam, as described in the example according to fig. 3. Reference is made here to fig. 3 and its description.
Fig. 2 shows an embodiment in operation. For this purpose, the blower candles 15 are guided on the connection adapter 2 into the operating position, so that the centering attachments 27 are held on the stop 19. The stop 19 is held substantially centrally on the underside of the spinning beam 6 relative to the annular spinning nozzle 4. The annular spinning nozzle 4 is connected to a spinning pump 16 via a melt distributor 18. The spinning pump 16 is connected via a melt inlet 17 to an extruder device, not shown here.
In the operating position shown, the polymer melt is fed by the spinning pump 16 into the annular spinning nozzle 4, which extrudes a plurality of filaments on its underside. The filaments form an annular arrangement of filament bundles which are guided uniformly distributed over the circumference of the blower candle 15.
In order to generate a cooling air flow, the cooling air is guided into the pressure chamber 25 of the connection adapter 2 via the intake channel 3. The pressure chamber 25 is connected to the blow-in inlet 21 on the outlet side 30 of the connection adapter 2, wherein the cooling air penetrates the flow barrier 5 inside the air channel 8. In this case, the temperature differences, the volume flow fluctuations and the pressure surges in the cooling air can be advantageously matched so that there is a homogenized cooling air in the region of the blower housing 20. A cooling air flow flowing radially from the inside to the outside is then generated by the blowing hood 20 and blown onto the filament bundle 7.
The invention is distinguished in particular in that the porous structure of the metal foam is particularly suitable for producing a low flow resistance in the flow barrier, so that only a low pressure drop has to be taken into account when conveying the cooling air and producing the blowing gas flow.
Claims (12)
1. An apparatus for cooling an annular extruded filament bundle which is extruded through a plurality of nozzle bores (4.1) of an annular spinning nozzle (4), having: an air blow generator (1) having a radially surrounding air blow outlet (11) and arranged centrally below the annular spinning nozzle (4); and a connection adapter (2) which connects the insufflation flow generator (1) with the air inlet channel (3),
it is characterized in that the preparation method is characterized in that,
the connection adapter (2) is provided with a flow barrier (5) made of porous metal foam (33).
2. The apparatus of claim 1, wherein the metal foam is a porous aluminum foam.
3. The apparatus according to claim 1 or 2, wherein the metal foam (33) of the flow barrier (5) has a pore size in the range of 5PPI to 15 PPI.
4. The apparatus according to claim 1 or 2, characterized in that the flow barrier (5) is designed plate-shaped and has a minimum height (H) of 10 mm.
5. The apparatus according to claim 1 or 2, characterized in that the flow barrier (5) is designed plate-shaped and has a minimum height (H) of 30 mm.
6. The device according to claim 1 or 2, characterized in that the flow barrier (5) extends on the inlet side (29) of the connection adapter (2) inside the free flow cross section of the air channel (8), the air channel (8) forming the inlet channel (3).
7. The apparatus according to claim 6, characterized in that the connection adapter (2) is arranged at the lower side of the spinning beam (6) at the center of the annular spinning nozzle (4), the air inlet channel (3) penetrating the spinning beam (6) until reaching the connection adapter (2).
8. Device according to claim 7, characterized in that the blowing flow generator (1) is formed by a blowing nozzle arrangement (9), wherein radially surrounding ventilation slots (12) form blowing outlets (11).
9. Device according to claim 1 or 2, characterized in that the flow barrier (5) extends on the discharge side (30) of the connection adapter (2) inside the free flow cross section of the air channel (8), the air channel (8) forming the blow inlet (21) of the blow flow generator (1).
10. The apparatus according to claim 9, characterized in that the blowing flow generator (1) is a hollow cylindrical blowing candle (15) having a blowing inlet (21) on the open end, the connection adapter (2) being arranged at a distance below the annular spinning nozzle (4) and supporting the blowing candle (15).
11. Device according to claim 10, characterized in that the blowing candle (15) has a gas-permeable blowing casing (20) as a blowing outlet (11), which surrounds the air channel (8) until it reaches the closed end.
12. Device according to claim 10, characterized in that the blowing candle (15) is designed in a height-adjustable manner on the connection adapter (2).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102016004715.1 | 2016-04-19 | ||
| DE102016004715.1A DE102016004715A1 (en) | 2016-04-19 | 2016-04-19 | Apparatus for cooling an annular extruded filament bundle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107304487A CN107304487A (en) | 2017-10-31 |
| CN107304487B true CN107304487B (en) | 2021-11-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710252029.2A Active CN107304487B (en) | 2016-04-19 | 2017-04-18 | Device for cooling an annularly extruded filament bundle |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN107304487B (en) |
| DE (1) | DE102016004715A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116427039B (en) * | 2023-03-15 | 2024-05-28 | 浙江恒优化纤有限公司 | Multi-head spinning polyester mixed filament production process and equipment |
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2016
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107304487A (en) | 2017-10-31 |
| DE102016004715A1 (en) | 2017-10-19 |
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